2008 F150 Fuse Box Diagram: Exploring the Fuse Boxes
2008 F150 Fuse Box Diagram: Find the correct fuse for the circuit you’re working on
This article shows you the 2008 F150 Fuse Box Diagram for the Passenger Compartment Fuse Box, also called the Power Distribution Box or the Central Junction Box. In your 2008 Ford F150, the electrical system is designed with a primary fuse box and an auxiliary relay box. The Passenger Compartment Fuse Box, Power Distribution Box, or Central Junction Box, is located under the dashboard on the passenger side. To access this fuse box, you’ll need to crawl under the dash and locate the trim panel and fuse box cover concealed in the footwell area.
To learn more about automotive fuses, see this article
To learn how to check a fuse visually or without removing it, see this article
Find the most commonly replaced fuses and bulbs here
The fuse box diagram and table below show all 71 fuses and all the relays. But most DIYers are looking for fuses and relays for the lights, power ports, and the blower motor. I’ve listed the most commonly checked/replaced fuses here to save time. I’ve also listed the most commonly replaced bulbs. A blown fuse or bulb are the two most common reasons for lighting issues
• Backup Light: Fuse #14 10A, Bulb #3156
• Blower Motor: Fuse #116 30A and #13 10A
• Headlight Low Beam Passenger Side: Fuse #23 10A, Bulb #H13 (dual filament for high and low beams)
• Headlight Low Beam Driver’s Side: Fuse #25 10A, Bulb #H13 (dual filament for high and low beams)
• Headlights High Beam: Fuse #35 20A, Bulb #H13 (dual filament for high and low beams)
• Horn: Fuse #26 20A
• Parking lamps: Fuse #6 15A Mini Fuse, Front park turn bulb #3157A (amber)
• Power Ports: Rear: Fuse #37 20A, Instrument Panel: Fuse #117 20A, Cigar Lighter #110 20A, Overhead #18 10A
• Stop and Turn lights: Fuse #2 20A Mini Fuse, Bulb #4057 or #3057
2008 F150 Fuse Box Diagram for Cabin Fuse Box in the passenger compartment
The cabin panel is located under the dash on the right-hand side of the instrument panel. Remove the trim panel and fuse box cover to access the fuses. To remove the fuse box cover, place a finger behind the PULL tab and your thumb above the PULL tab. Then pull the cover off.
How to find your fuse and the devices served by that fuse
There are 62 fuse slots in the cabin power distribution box. The chart shows only 10 to speed up load time. Here’s how to find the fuse and circuit you want.
1) Change the number of entries showing (in the Show Entries Box) to 100 and scroll the list.
2) Enter the name of the component you’re searching for in the Search box.
3) Use the Next/Previous buttons at the bottom of the table
| Fuse number | Amperage | Circuits protected |
|---|---|---|
| F1 | 10 | Windshield wiper motor, Instrument Cluster (IC), Audio Control Module (ACM), Ignition switch |
| F2 | 20 | Stop/Turn lamps, ABS, T/T electric brake module, PCM (BOO signal), turn signal mirrors, CHMSL |
| F3 | 7,5 | Power mirrors, Memory seats and pedals |
| F4 | 10 | DVD battery power, Power fold mirror |
| F5 | 7.5 | Powertrain Control Module (PCM), Autolamp/sunload sensor, HVAC module, EATC, HVAC module, EATC, Evaporative emission canister vent solenoid |
| F6 | 15 | Parklamps, Body Security Module (BSM), Instrument panel illumination |
| F7 | 5 | Audio Control Module (ACM) |
| F8 | 10 | Heated mirrors, Switch indicator |
| F9 | 20 | Fuel pump relay, Fuel injectors, Injector sense |
| F10 | 20 | Trailer tow back-up lamps relay, Trailer tow parklamp relay |
| F11 | 10 | A/C clutch relay, Integrated wheel ends solenoid |
| F12 | 5 | PCM power relay |
| F13 | 10 | HVAC module, EMTC, HVAC module, EATC, Indicator flasher relay, Heated rear window relay, Blower motor relay, Trailer tow relay, battery charge |
| F14 | 10 | Back-up lamp and Daytime Running Lamps (DRL) relay coil, A/C pressure switch, Redundant speed control switch, Heated PCV (5.4L), ABS |
| F15 | 5 | Floor shifter, Overdrive cancel switch, Instrument Cluster (IC), Traction control switch |
| F16 | 10 | Brake-shift interlock solenoid |
| F17 | 15 | Fog lamp relay |
| F18 | 10 | Parking Aid Module (PAM), Electronic compass, Auto-dimming interior mirror unit, Heated seat module, driver side front, Heated seat module, passenger side front, Vehicle Security Module (VSM), Auxiliary power point |
| F19 | 10 | Occupant Classification System Module (OCSM), Restraints Control Module (RCM) |
| F20 | 10 | Auxiliary power point |
| F21 | 15 | Instrument Cluster (IC) |
| F22 | 10 | Audio Control Module (ACM), Roof opening panel switch, Door lock switch, passenger side, Door lock switch, driver sid |
| F23 | 10 | Headlamp, right |
| F24 | 15 | Battery saver relay |
| F25 | 10 | Headlamp, left |
| F26 | 20 | Horn relay |
| F27 | 5 | Passenger Air bag Deactivation (PAD) indicator, Instrument Cluster (IC) |
| F28 | 5 | Passive anti-theft transceiver module, Powertrain Control Module (PCM), Fuel pump diode |
| F29 | 15 | PCM 4x4 power |
| F30 | 15 | PCM 4x4 power |
| F31 | 20 | Audio Control Module (ACM), Satellite Digital Radio Receiver System (SDARS) module |
| F32 | 15 | Evaporative emission (EVAP) canister purge valve, A/C clutch relay, Charge Motion Control Valve (CMCV), Electronic fan clutch, Heated Oxygen Sensor (HO2S) #11. Heated Oxygen Sensor (HO2S) #21, Mass Air Flow/Intake Air Temperature (MAP/IAT) sensor, Heated positive crankcase ventilation (PCV) valve, EGR system module Variable Camshaft Timing (VCT) valve 1, Variable camshaft Timing (VCT) valve 2, Camshaft position sensor |
| F33 | 15 | Shift solenoid, CMS #12 and #22, Ignition coils |
| F34 | 15 | Powertrain Control Module (PCM) |
| F35 | 20 | Instrument cluster high beam indicator, High beam headlamps, DRL disable relay |
| F36 | 10 | Trailer tow connector, Park/stop/turn lamp, right rear, Multifunction switch |
| F37 | 20 | Power point, console 1, Power point, console 2 |
| F38 | 25 | Subwoofer |
| F39 | — | Not used |
| F40 | 20 | Daytime Running Lamps (DRL) enable relay, Vehicle Security Module (VSM), Main light switch, Multifunction switch |
| F41 | — | Not used |
| F42 | 10 | Trailer tow connector, Park/stop/turn lamp, left rear, Multifunction switch |
| F101 | 30 | Starter relay |
| F102 | 20 | Ignition switch |
| F103 | 20 | Anti-lock Brake System (ABS) module |
| F104 | — | Not used |
| F105 | 30 | Trailer brake control module |
| F106 | 30 | Trailer low relay, battery charge |
| F107 | 30 | Power door locks (BSM) |
| F108 | 30 | Seat control module, passenger side front |
| F109 | 30 | Adjustable pedal switch, Seat control switch, driver side front, Driver Seat Module (DSM) |
| F110 | 20 | Data Link Connector (DLC), Cigar lighter, front |
| F111 | 30 | Clockwise (CW) motor 4x4 relay, Counterclockwise (CCW) motor 4x4 relay |
| F112 | 40 | Anti-lock Brake System (ABS) module |
| F113 | 30 | Windshield wiper motor |
| F114 | 40 | Heated rear window relay, Heated mirror power |
| F115 | 20 | Roof opening panel module |
| F116 | 30 | Blower motor relay |
| F117 | 20 | Power point, Instrument panel |
| F118 | 30 | Heated seat module, driver side front, Heated seat module, passenger side front |
| F401 | 30 Circuit Breaker | power sliding window switch, rear, Roof opening panel module, Master window adjust switch, Window adjust switch, passenger side |
2008 F150 Relay diagram underhood relay box
F150 underhood relay box
Tips to diagnose electrical issues on your 2008 F150
If your power windows don’t work
• The power windows don’t use fuses. They get power from a 30A circuit breaker #401 in the fuse box diagram above.
If your blower motor doesn’t work
The blower motor gets its power from the blower motor relay #R06 in the fuse box diagram above. Power comes into the motor on the brown/yellow wire. It seeks ground through the brown/white wire, which runs to the fan speed switch and then to ground #203, located in the passenger footwell.
If the circuit you’re working on contains a relay
• A simple way to test a relay is to swap in a similarly shaped relay and see if the component works.
• If that doesn’t work, remove the relay and test for power to the relay control coil and contacts using a multimeter. For more information on relay testing, see this article.
©, 2024 Rick Muscoplat
Posted on by Rick Muscoplat